What is the script error?

Question

Python

I am making a script that allows the user to place a bet, but there was a problem that sometimes the user is either added more than his bet, then more than his bet is removed, then it goes into a minus.
Here is the script itself:

msg = event.obj["text"].lower()
      text = msg.split(' ', maxsplit=1)
      if text[0] == "!ставка":
          get_msg = text[1].split(" ")
          get_side = get_msg[0]
          get_rate = get_msg[1:]
          text_rate = ' '.join(get_rate)
          value_rate = re.sub(r'[^0-9.]+', r'', text_rate)
          user_id = event.obj["from_id"]
          sides = ["орел", "решка"]
          if value_rate in "":
              send("❗ | Неправильно указан формат!\n✔ | Правильный формат: !ставка [орел/решка] [сумма]")
          if user_id not in money_bag:
              send("❗ | Вы ещё не завели себе кошелёк.\n✔ | Кошелёк можно завести командой: !кошелёк")
          if money_bag[user_id] < int(value_rate):
              send("❗ | Вам не хватает средств чтобы сделать ставку на эту сумму.")
          if money_bag[user_id] == int(value_rate):
              send("❗ | Нельзя ставить весь кошелёк как ставку.")
          if value_rate:
              if get_side in sides:
              	if user_id in money_bag:
                    if money_bag[user_id] >= int(value_rate):
                        if money_bag[user_id] != int(value_rate):
                            coin_side = random.randint(1,100)
                            if coin_side <= 40:
                                money_bag[user_id] = money = money + int(value_rate)
                                with open('money_bag.txt','w') as f:
                                    for key,val in money_bag.items():
                                        f.write('{}:{}\n'.format(key,val))
                                send("✔ | Вы победили!\n | Вам зачислено " + str(value_rate) + " руб.")
                            else:
                                money_bag[user_id] = money = money - int(value_rate)
                                with open('money_bag.txt','w') as f:
                                    for key,val in money_bag.items():
                                        f.write('{}:{}\n'.format(key,val))
                                send("❌ | Вы проиграли!\n | С вашего счёта списано " + str(value_rate) + " руб.")

Answer 1

What is it?
money_bag[user_id] = money = money + int(value_rate)